1918467720 has 384 divisors, whose sum is σ = 7241529600. Its totient is φ = 450717696.

The previous prime is 1918467709. The next prime is 1918467721. The reversal of 1918467720 is 277648191.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1918467721) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4197732 + ... + 4198188.

It is an arithmetic number, because the mean of its divisors is an integer number (18858150).

Almost surely, 2^1918467720 is an apocalyptic number.

1918467720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918467720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3620764800).

1918467720 is an abundant number, since it is smaller than the sum of its proper divisors (5323061880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1918467720 is a wasteful number, since it uses less digits than its factorization.

1918467720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 1918467720 is about 43800.3164372131. The cubic root of 1918467720 is about 1242.5622789544.

The spelling of 1918467720 in words is "one billion, nine hundred eighteen million, four hundred sixty-seven thousand, seven hundred twenty".